Amen!

I'm the one that's got to die when it's time for me to die, so let me live my life the way I want to - Jimi Hendrix

Exactly.

So I drink and I smoke, among other things that are not good for me, but you know what? Not everyone was meant to, nor does everyone want to live to be 100 years old. Maybe I am killing myself with this cigarette, but that's my decision, not yours so back off. It's my body and if some days I just want to treat it like shit and smoke a whole pack, so be it. It's not hurting you any. No one lives forever, no matter how much they want to believe they can.

Edit:
Here's a lovely quote that I feel compelled to share now, from my favorite television show of all time...
"And just so you know, it's not that common, it doesn't happen to every guy, and IT IS A BIG DEAL!" - Rachel to Ross